Task did not exit gracefully and lost TaskManager
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Task did not exit gracefully and lost TaskManager
![Yan Zhou [FDS Science] ](/images/avatar100.png "Yan Zhou [FDS Science] "){kind=avatar} 
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Hi, when I stop my flink application in standalone cluster, one of the tasks can NOT exit gracefully. And the task managers are lost(or detached?). I can't see them in the web ui. However, the task managers are still running in the slave servers.
What could be the possible cause? My application run Over-window aggregation on a datastream table, the results are written into a custom mysql sink with org.apache.commons.dbcp.BasicDataSource. Close methods are called for the PreparedStatement, Connection, and BasicDataSource within AbstractRichFunction::close()
Is it because of mysql jdbc doesn't handle interrupt propertly? Should I call PreparedStatement::cancel()? I find a similar issue here[1]. Thank you for your help.
[1] : https://stackoverflow.com/questions/40127228/flink-cannot-cancel-a-running-job-streaming
Best Yan
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Re: Task did not exit gracefully and lost TaskManager
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Here is the exception and error log:
2018-05-29 14:41:04,762 WARN org.apache.flink.runtime.taskmanager.Task - Task 'over: (PARTITION BY: uid, ORDER BY: proctime, RANGEBETWEEN 86400000 PRECEDI
NG AND CURRENT ROW, select: (id, uid, proctime, group_concat($7) AS w0$o0)) -> select:
(id, uid, proctime, w0$o0 AS EXPR$3) -> to: Row -> Flat Map -> Filter -> Sink: Unnamed (10/1
5)' did not react to cancelling signal for 30 seconds, but is stuck in method:
org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:199)
org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:103)
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:306)
org.apache.flink.runtime.taskmanager.Task.run(Task.java:703)
java.lang.Thread.run(Thread.java:748)
...
...
2018-05-29 14:43:34,663 ERROR org.apache.flink.runtime.taskmanager.Task - Task did not exit gracefully within 180 + seconds.
2018-05-29 14:43:34,663 ERROR org.apache.flink.runtime.taskexecutor.TaskExecutor - Task did not exit gracefully within 180 + seconds.
2018-05-29 14:43:34,663 ERROR org.apache.flink.runtime.taskexecutor.TaskManagerRunner - Fatal error occurred while executing the TaskManager. Shutting it down...
2018-05-29 14:43:34,666 INFO org.apache.flink.runtime.taskexecutor.TaskExecutor - Stopping TaskExecutor akka.tcp://flink@fds-hadoop-prod04-mp:35187/user/taskmanager_0.
2018-05-29 14:43:34,669 INFO org.apache.flink.runtime.state.TaskExecutorLocalStateStoresManager - Shutting down TaskExecutorLocalStateStoresManager.
From: Yan Zhou [FDS Science] <[hidden email]>
Sent: Tuesday, May 29, 2018 11:04:52 PM To: [hidden email] Subject: Task did not exit gracefully and lost TaskManager Hi, when I stop my flink application in standalone cluster, one of the tasks can NOT exit gracefully. And the task managers are lost(or detached?). I can't see them in the web ui. However, the task managers are still running in the slave servers.
What could be the possible cause? My application run Over-window aggregation on a datastream table, the results are written into a custom mysql sink with org.apache.commons.dbcp.BasicDataSource. Close methods are called for the PreparedStatement, Connection, and BasicDataSource within AbstractRichFunction::close()
Is it because of mysql jdbc doesn't handle interrupt propertly? Should I call PreparedStatement::cancel()? I find a similar issue here[1]. Thank you for your help.
[1] : https://stackoverflow.com/questions/40127228/flink-cannot-cancel-a-running-job-streaming
Best Yan
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Re: Task did not exit gracefully and lost TaskManager
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